linux-kernel - Re: [PATCH 12/13] xfs: make the calculation generic in xfs_sb_validate_fsb

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Message-ID: <ZdyQdGkSIw9OsSqc@casper.infradead.org>
Date: Mon, 26 Feb 2024 13:21:56 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, david@...morbit.com,
	chandan.babu@...cle.com, akpm@...ux-foundation.org,
	mcgrof@...nel.org, ziy@...dia.com, hare@...e.de, djwong@...nel.org,
	gost.dev@...sung.com, linux-mm@...ck.org,
	Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH 12/13] xfs: make the calculation generic in
 xfs_sb_validate_fsb_count()

On Mon, Feb 26, 2024 at 10:49:35AM +0100, Pankaj Raghav (Samsung) wrote:
> +	if (check_mul_overflow(nblocks, (1 << sbp->sb_blocklog), &bytes))

Why would you not use check_shl_overflow()?

> +		return -EFBIG;
> +
> +	mapping_count = bytes >> PAGE_SHIFT;
>  	/* Limited by ULONG_MAX of page cache index */
> -	if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
> +	if (mapping_count > ULONG_MAX)
>  		return -EFBIG;
>  	return 0;
>  }
> -- 
> 2.43.0
>